Claude Cowork Sandbox Network Whitelist Broken with 403s

Multiple individual-plan users report that Claude Cowork's cloud sandbox blocks all outbound requests with 403 errors despite correct allow-list settings, preventing access to their own database URLs. The proxy cites organization policy, suggesting the whitelist mechanism is broken.

2026-09-11 ~ 2026-09-12 · 2 related posts

• Claude Cowork 403 "organization policy denial" persists for Pro user despite full domain allowlist — Vylix · 2026-09-11
• Claude Cowork sandbox 403s every host despite "All domains" egress setting, user investigates — Easy-Flan-1698 · 2026-09-12